Comparison of Channel Estimation Methods for Pilot Aided OFDM Systems

Henkel, Martin; Schilling, C. J.; Schroer, Wolfgang

doi:10.1109/vetecs.2007.300

Cited by 23 publications

(17 citation statements)

References 6 publications

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“…In this paper, the latter approach is used, time interpolation is performed first and frequency interpolation follows after. As soon as the channel values at pilot positions are obtained from (4), some conventional techniques such as linear [5], [6], [12] or cubic-spline [13], [14] interpolation can be utilized to estimate channel values at data subcarriers. Figure 5 demonstrates an example of the linear interpolation technique in time direction for the same-located clusters in a stream of an even number of OFDM symbols.…”

Section: Conventional Channel Estimationmentioning

confidence: 99%

Pilot-Aided Channel Estimation for WiMAX 802.16e Downlink Partial Usage of Subchannel System Using Least Squares Line Fitting

Pham

Wada

2010

IEICE Trans. Commun.

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This paper presents a pilot-aided channel estimation method which is particularly suitable for mobile WiMAX 802.16e Downlink Partial Usage of Subchannel mode. Based on this mode, several commonly used channel estimation methods are studied and the method of least squares line fitting is proposed. As data of users are distributed onto permuted clusters of subcarriers in the transmitted OFDMA symbol, the proposed channel estimation method utilizes these advantages to provide better performance than conventional approaches while offering remarkably low complexity in practical implementation. Simulation results with different ITU-channels for mobile environments show that depending on situations, enhancement of 5 dB or more in term of SNR can be achieved.

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Section: Conventional Channel Estimationmentioning

confidence: 99%

Pilot-Aided Channel Estimation for WiMAX 802.16e Downlink Partial Usage of Subchannel System Using Least Squares Line Fitting

Pham

Wada

2010

IEICE Trans. Commun.

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“…On the other hand, for data symbol, in this particular case of DL-PUSC, the interpolation task must be performed from cluster to cluster, and because each cluster contains only 14 consecutive subcarriers, the channel on each cluster can be approximated as a "line"; this fact inspires the idea of using LSLF technique to estimate the partial channel. Therefore, a comparative study is carried out to demonstrate the superiority of this approach to other commonly used methods such as linear [5,6] and cubic spline [7,8] interpolations.…”

Section: Signal Model Assume That Transmitted Frame Hasmentioning

confidence: 99%

“…By scattering known data called pilots into OFDM symbol at the transmitter, calculating channel values at pilot positions and then interpolating the whole channel values for data subcarriers at the receiver, transmitted information can be recovered. There are many techniques reported for channel estimation; some conventional methods like linear and cubic spline [5][6][7][8] interpolations are commonly used due to their low complexity for practical implementation, yet low efficiency. Other methods like transform-domain processing [9,10] perform better but require higher computation for executing DFT/IDFT.…”

Section: Introductionmentioning

confidence: 99%

Effective Scheme of Channel Tracking and Estimation for Mobile WiMAX DL-PUSC System

Pham

Wada

2010

Journal of Computer Systems, Networks, and Communications

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This paper introduces an effective joint scheme of channel estimation and tracking for downlink partial usage of subchannel (DL-PUSC) mode of mobile WiMAX system. Based on the pilot pattern of this particular system, some channel estimation methods including conventional interpolations and a more favorable least-squares line fitting (LSLF) technique are comparatively studied. Besides, channel estimation performance can be remarkably improved by taking advantage of channel tracking derived from the preamble symbol. System performances in terms of packet error rate (PER) and user link throughput are investigated in various channels adopted from the well-known ITU models for mobile environments. Simulation results show a significant performance enhancement when the proposed joint scheme is utilized, at least 5 dB, compared to only commonly used channel estimation approaches.

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“…In Refs. [12][13][14][15], a pilot assisted channel estimation, called PACE in this paper, was presented for OFDM using GI insertion. If no GI insertion is used for the pilot block similar to the overlap FDE, the accuracy of channel estimation significantly degrades due to the IBI from the previous data block.…”

Section: Channel Estimationmentioning

confidence: 99%

Pilot assisted channel estimation for MC-CDMA signal transmission using overlap FDE

Tomeba

Takeda

Adachi

2008

2008 11th IEEE Singapore International Conference on Communication Systems

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Abstract-Recently, multi-carrier code division multiple access (MC-CDMA) has been attracting much attention as a broadband wireless access technique for the next generation mobile communications systems. Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can take advantage of the channel frequency-selectivity and improve the average bit error rate (BER) performance due to frequencydiversity gain. However, conventional MC-CDMA requires the insertion of guard interval (GI) and this reduces the transmission efficiency. Overlap FDE technique has been proposed that requires no GI insertion. Recently, we showed that MC-CDMA using overlap FDE can provide almost the same BER performance as the conventional MC-CDMA downlink using the GI insertion. However, our previous work assumed the ideal channel estimation. In this paper, we propose a pilot assisted channel estimation technique suitable for MC-CDMA downlink using overlap FDE and evaluate the BER performance by computer simulation.

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Comparison of Channel Estimation Methods for Pilot Aided OFDM Systems

Cited by 23 publications

References 6 publications

Pilot-Aided Channel Estimation for WiMAX 802.16e Downlink Partial Usage of Subchannel System Using Least Squares Line Fitting

Pilot-Aided Channel Estimation for WiMAX 802.16e Downlink Partial Usage of Subchannel System Using Least Squares Line Fitting

Effective Scheme of Channel Tracking and Estimation for Mobile WiMAX DL-PUSC System

Pilot assisted channel estimation for MC-CDMA signal transmission using overlap FDE

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